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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1de9c5989b2a3263bbc6b4860a18d598bb1ffd30110a81a0cbe538a3badcedaa' 
  AND token = 'db5GhPUYUJvmdVjrf7wV1Isf+kwPP/5wB7gf41aeOn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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