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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a04fa8c63294ce83e8cc14e82a85088aba8c51e7171c892bc26f689997fbd9f' 
  AND token = '0shvQKeIooDKS68vc9JokIbreCMX/kRfcgf7o5TMOhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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