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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ee2646042c42d827fd60b7787863568ef99baa6724f607a16b79e93fdde8411' 
  AND token = 'cgX2N6dtIkFMmoE/S+QXqS/0NS1+cRGi6LjqQMUYdSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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