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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa2bf2a437f465840166339fc05b481dc73c4cab1bfbf87ae727f1889d4cb11a' 
  AND token = 'Q5zVns60kAPtUo4h2NCIo4DEU6RADgDOHNtnrxU68q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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