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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7df0da19b5686f3a1203e3f7e969ddead417198df3311a545b5bf718c06e9f94' 
  AND token = 'VWSElBCDFiSJ2eYka/z4Np1G1cJyCCF/qnxG2GmY+9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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