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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03c98a62a97510caf601e264c5ddaf77659cf38be6857ce3423f1853c1d5b195' 
  AND token = 'AnPEG5FkwM24VJYrapKXaBW/REftY5avAta7KHtEOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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