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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7fb429176db82ac3f9d6dd3c750e0fac1da03a150c0ead7af43484813e382c72' 
  AND token = 'LPuX3zlPAYNUvx70YCuljPEfSBExgyh14IaPL83A8js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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