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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9e5017b37510276d0b3e1afba539df1d76cf4ede1eaf9635cd8d085419cd39e' 
  AND token = 'cB+dcjFks49k2frfKSUQnMwhd1RhKo722V/ihhfpTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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