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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '808885468fec4e06416773f582bc6c907c6c70fd1be7a45725db41e0b86f643e' 
  AND token = 'I0Uqk7Y663W5yu0EUZjyW7+yfDTa288KnfBl6Y3ze60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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