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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67db5561a3bbf9f27d2903d9908f2b9b1d5ebd977488ca5e4e659a2f5ffa30f7' 
  AND token = '9lzUb7vW2gYtrcgJqU3D99k9j8pvHNHP4OftMCpz2NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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