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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfa5e6047363b7d2d212d1cf10a972f489dd4089c16b80f1b03decdb540a818c' 
  AND token = 'RVygrZbz2o2wYIy9rYYignDiSemZ9ZPFfrA4nngltoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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