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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e76b5dcc37d2319dfe86942880d59f1297b416daf4790b999d03b5a45bda30a2' 
  AND token = 'gqbw6mdSbL7ZGCa0ekB+bqrarqNbwkXeOOAC/RP2+c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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