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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e988bfbdc66968c1d8e5ff609544309f196a0c65dacb5c6e18ca269e725aef67' 
  AND token = 'GyyEWYmSLlRS8sNGRJKKAlDYkoJ1ZyMm9PxlUNsKysE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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