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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc73b32f379b9533276527aa95fa7de478516c66535c7ef803fe5e1adaffa96d' 
  AND token = '2OVSauSQbD5UmlrhmZ7IyY7z6ioufSyb0LlpuvI+Vao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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