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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19dfddd55eaaf4c308d5f3a4c2b07bc94ba23e251529d2b9109035cb194b799c' 
  AND token = 'btzCx5E9YrtkDi2Ja7MpQtq6kbLAZcJovBpSqe/BOwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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