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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e197fa7f4347e328227c8424302569133043142e4c58bc507dc6316588bfc012' 
  AND token = 'Zep9DuKqIMyZXNZfIJe/EMI14u6ZG3mR5hmHQqxkmM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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