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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd52aef3d28c9aca624d1e7b3033baf7633d72ccb32840ac9e9a75aab87b1c1f9' 
  AND token = 'nq2EGmKVvzHdOiw9kG3OQlUUAatg/QnsoWRGGnr3zHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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