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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cadc5b6bab4eccf3cf5f3d381b2e26310b94d01929dc116492f35d2a539bb9ea' 
  AND token = 'Ta8PIUTLNv+I6JChRjMj4PZLOn2YptoK6bKHV9tpPmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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