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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a29da5e685906bcea860ffa6f30e771148c30e376f246ad28d3b06b19f9bc4c' 
  AND token = 'uaEVQrXSbhqe+BcYkj19m3mFy8HWra9HCipfSkxl0Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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