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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '389a56ea2b5e8ce82b0e697fe81c0b007c4ede2f81d3c086986f764a33a4ede4' 
  AND token = 'l1rm/VvAEztYxkxYtLF/VBEtYW9RoP9XN2DsikIizNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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