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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cdca01ddc451936d9356437c02bd8879236305e27ae757fc0ed0900070095138' 
  AND token = 'zwHOQzbl40N7zOi1+CTx7WIQW+5BLmMbUco4f7nUuRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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