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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd243714b8d20a874364aa2cf6c82c5e13f5e88a544869d8d9dd5a3e2f0bd4ab' 
  AND token = '28vaL4/9LwfBLV88HS0Lw/34gI8ChG3eenKRMCUsPtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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