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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '185f77b5c3288da41134b989329b67799da68aab54f398aedbdebb2068fc4ed6' 
  AND token = 'UdCt5GWcQ7uHZ6D5utRG0yw5CGoXpjx7e4xjX3De40A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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