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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '061c07150f94d4cd72b5b78235da97fba62aca69f4dd52301aa17d16aeb41d4a' 
  AND token = 'uhFjcs4n8z3wgogexcCp7t3vGKXaHeBcjzYBeRaNzOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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