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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2686ad3767d0e4522a96173cf81ef15d67d6bf063065c5883225c51f9d749a64' 
  AND token = '38EEajMO0Xi4/Enk4kR/v6lK52U3zfncnghrezfHDHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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