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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d4bdcfb8e532a067ed16f8aeec9cb30af75904ea3129db2eb3817cf8ad924b9' 
  AND token = 'K7+ElCiLI3kfrea0cXiJj45KwC5vivfGfXj3oF5/+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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