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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '342d7ff214ed07f931e3105ab42949e155702c3396047be519b97d8a634abf65' 
  AND token = 'nKE21OnjfKE3G7RT1i/3y9CCqkB/xx2NawsHVFobpTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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