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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f5fb3532a26756425ff15bea57f60494890fb97ea9a1b1c21ffd042c87e2369f' 
  AND token = 'lF2xHnEzl/0QTqT9AWnLds4ESh+G1t+2WFK55Y05YBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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