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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cb1fdc15eaf45fbd728daecb7c26d6ec3e5993616954fb5a2497c1f90599a09' 
  AND token = 'tqclsC5uo+rsstJ8TvT0FhLnODDUJUPfggX6VV14Lgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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