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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12c35f2ef13c05042c333e9f1d4af5230f366b1b1e8f0b96d81fe40896296004' 
  AND token = 'Io1E0/MichmBn+2l0g+1o08wYVrdKk+fq1qfoR3lKPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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