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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b3a58db13450f91d2ff8bbf3a2f4ecab47882fe347c5c4c694276cb1dc4d3c7' 
  AND token = 'GbPLAzO/w3NF54BRbxDDOFDQ1uODup/CU2UsbSaRXzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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