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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2438a6e5151699a0a906cd105e10aaae03f499e149b13bf8fcb62dc97340b6b0' 
  AND token = '+QKsq1Cwp+iRlTXiX3g1McRdFO8ooj3dLHk2ULA97Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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