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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb7ea26d81975d06418e725d23e0067002f999c0dd83b0504ca34473baad17b4' 
  AND token = 'I5ecz9XDnTXdXVfxld/pg2fcAdT9qLGgZZ4p+OuLsDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}