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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1aeea7e217e9b201cfcbfe6e87c9bf9c51a3900d51a7d7e456396c5f45fab155' 
  AND token = '5kc7U7wBwmoh3H0lYYKDeWS0FvNAiaXIvptwJGphF0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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