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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6febb9d31cfec5c2b35c01edbbdf91a86a6c91a8b5e38a798c6bb09b92e6ddb' 
  AND token = '6RpqVDRuHYbozw5btQjMo+vNGitWZlzy5gJn6sveRNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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