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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f57d893bafb5dca9de1d62e9d07c92aaac7eb6fecf60ee66d82bb4b7a1d0255' 
  AND token = 'TKZXvtPpOfRsWb10+9uawEhm/BuxzcL9taM0pzgkkO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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