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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7af0ffdb6878cd6c5df917892be786cc58ecc85fcb5c110bcd2993cad903c23' 
  AND token = '1L1XVLhcTAZ3NUzLWMoyphobhdhyYgozfhVgZkOaefI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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