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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b2579c4bb649da71ff8e3493615288e87588794b2a581098582ff7b03adb856' 
  AND token = 'Sr7s4oht+tW++XpLps1qoXweofEMvfH29ulI5roX0PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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