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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5de6b7c9f6e0258301635339e72035baa5534425c394380217d34faeb9dc41f8' 
  AND token = 'QUYpGtRkmyQIUS/zw2DS+rr8971DgKt0aAMp23kNdp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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