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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c1a6fafe07a84b8b914c1f7773da8a828dd71971f453f93c4c5182d1155803e' 
  AND token = '/JtmEUCfFCshuw7/k+6ffi8i9ZzRbdT1eWSRW1/7jaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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