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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c837f6d76e54512f3846f5bb10d27afa339e9d6bb9193c711523cdf93e7fa96b' 
  AND token = 'krwS2uMG/UGFeRmVQFu/6UCQ6RvNuDHsXe0000el1ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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