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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f37aac34a9151987bc1874c978c0d6abcdf72459b417c6d7234cd9a97f9bcc9' 
  AND token = 'gbTSbQMpz6nbXBBZgf4Q/J83ufMYyyEUY+DYWJveb40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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