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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b6474953105071d1f437fd2214cd8bbae4ced5ee18afa8c9cf6e7ad4597a071' 
  AND token = 'uk16H++L2FMfL9VwwfYi5Hoxd/AClMP+iZsMjdN8J44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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