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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24bd679cedd99f8a0332dc7fb7d7c36805d63b75ce7cccda3d3cd54ffe717db0' 
  AND token = 'evpnZ24qxTbH6egCW6U5N4lYovQ+v0f4WCCm90pdpR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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