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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd07c6c3b98ab91ec64097d63cef4c94e44e70b155de019222fb255b3bd5e411f' 
  AND token = 'LngWKfIC1rqlCaMyc+l58Zb/M1p//nv4SkgJ/P0xnMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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