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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b6d9b363e0cee3bde7691bb5dcb860bb203e7c79137ebb83b2a7e20865e3ce14' 
  AND token = '/cMDx2E4xtvUp+ArqdHWYB9IR/+6RnUqoimznzSvyJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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