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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cc64836d6564bc71b60bfdfceb3208410fe9d8a95011629887948f12fb47ae20' 
  AND token = '0R33X9/krv3Q9cpoe2/JG9mYn1+1xP5kJgYunu5R/UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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