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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0156f810cd78538e0296bb05edfb67c145a0a1706aa991dd2e4935ed59c78d85' 
  AND token = 'NaI6GJE8NugAkmqsuvQJM0Td9dDC1HqWMykTiOXHFss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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