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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d2588ae87184dd9e978109863a5482523821ff16de13315da0de62b18165d3f' 
  AND token = 'uLJ20YMx2Va6As7iq37gwmb70ApkaChnrHyntlk/CsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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