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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f2a9a32f53b35c0a753c24463874bc3b16e3e3dc9aba70713b5b75e729b1931' 
  AND token = 'ftcx8X0Xkuyh11ieqcSysCFhq9E2r/853UPtqsWc2w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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