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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4dbf010a489b7589839e419aa173eb27626a96a7f4fd99c0af8d6b2b79cc9472' 
  AND token = 'VcWu/T52MuglcuBwjXn6lGrSiN0Pz/bniMnRNvN/79I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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