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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4adf6cd4eb77e17c33cd8d2272e4e0013a40f0f2899ae02e32bb69c89d348d81' 
  AND token = '9cMYaab+QI4ry0xiQScsU+oCDdoXPcGdyLWtt0Yv1zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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