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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e93ff072d3b45a128ac33fd30e310d0e0db9736dc18ce5cefd4430b2959b7e0' 
  AND token = 'GlOv5h/AHVk3qFiS+4aeBGVItpLbAD0V7Rkgwast2MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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